GLOBAL ICE LOAD ESTIMATION ON ICEBREAKING VESSELS UNDER NORMAL OPERATING CONDITIONS

摘要

A global ice load prediction formula for the icebreaking vessels under normal operating condition in ice-covered sea isrnderived. Global ice load for normal operating conditions means the ice load from regular sea trials in moderate icernconditions. In this sense the extreme ice loads during heavy ramming or accidental collision are not major concern, butrnthey are also discussed for comparison. Available global ice load data from full-scale sea trials are collected andrnanalyzed according to various ship-ice interaction parameters including displacement, speed of a ship and flexuralrnstrength and thickness of sea ice. The ice load prediction formula is compared with the collected full-scale sea trials datarnand it agrees within a reasonable range.